# CVE-2020-13984: Denial of service in n/a

> An attacker can cause a denial of service in Contiki OS by sending crafted IPv6 extension headers that trigger an infinite loop in the uIP stack.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-w4rp-w99f-63vq

## What is CVE-2020-13984?

CVE-2020-13984 is a high-severity denial of service vulnerability in n/a, published on 11 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Contiki through 3.0. An infinite loop exists in the uIP TCP/IP stack component when processing IPv6 extension headers in ext_hdr_options_process in net/ipv6/uip6.c.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2020-13984?

It affects 1 product.


Products: Contiki-Os Contiki.

## How do I fix CVE-2020-13984?

No fix has been published for CVE-2020-13984 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-13984 being exploited?

There is no known exploitation of CVE-2020-13984 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-40523](https://insights.sbomify.com/CVE-2021-40523/): Denial of service in n/a (high 7.5)
- [CVE-2021-38386](https://insights.sbomify.com/CVE-2021-38386/): Memory corruption in n/a (high 7.5)
- [CVE-2021-38387](https://insights.sbomify.com/CVE-2021-38387/): Denial of service in n/a (high 7.5)
- [CVE-2021-38311](https://insights.sbomify.com/CVE-2021-38311/): Denial of service in n/a (high 7.5)
- [CVE-2021-28362](https://insights.sbomify.com/CVE-2021-28362/): Integer overflow in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-13984 and fix it if it is affected.

What it is: CVE-2020-13984 is a high-severity denial of service vulnerability in n/a, published on 11 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-13984 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-13984/ (Markdown: https://insights.sbomify.com/CVE-2020-13984/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-13984
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-13984
- OSV: https://osv.dev/vulnerability/CVE-2020-13984

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-13984/
Summaries are generated and may contain mistakes; the official description above is the record.